|                                                                                                                                          | United States                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------|
|                                                                                                                                          |                                                                                      |
|                                                                                                                                          | Securities and Exchange Commission                                                        |
|                                                                                                                                          |                                                                                      |
|                                                                                                                                          | Washington, D.C. 20549                                                                    |
|                                                                                                                                          |                                                                                      |
|                                                                                                                                          | Form 10-Q                                                                                 |
|                                                                                                                                          |                                                                                      |
| (Mark One)                                                                                                                                    |
|                                                                                                                                          |                                                                                      |
| R                                                                                                                                             | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934  |
|                                                                                                                                          |                                                                                      |
|                                                                                                                                          | For the quarterly period ended June 30, 2009                                              |
|                                                                                                                                          |                                                                                      |
| o                                                                                                                                             | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 |
|                                                                                                                                          |                                                                                      |
|                                                                                                                                          |                                                                                      |
|                                                                                                                                          | For the transition period from _____ to _____                                             |
|                                                                                                                                          |                                                                                      |
|                                                                                                                                          | Commission file number 333-150925-02                                                      |
|                                                                                                                                          |                                                                                      |
|                                                                                                                                          |                                                                                      |
|                                                                                                                                          | ATLAS RESOURCES PUBLIC 18-2009 (B) L.P.                                                   |
|                                                                                                                                          | (Name of small business issuer in its charter)                                            |
|                                                                                                                                          |                                                                                      |
|                                                                                                                                          |                                                                                      |
|                                                                                                                                          |                                                                                      |
| Delaware                                                                                                                                      | 26-3223040                                                                                |
| (State or other jurisdiction ofincorporation or organization)                                                                                 | (I.R.S. EmployerIdentification No.)                                                       |
|                                                                                                                                          |                                                                                      |
| Westpointe Corporate Center One                                                                                                               |                                                                                      |
| 1550 Coraopolis Heights Rd. 2nd Floor                                                                                                         |                                                                                      |
| Moon Township, PA                                                                                                                             | 15108                                                                                     |
| (Address of principal executive offices)                                                                                                      | (zip code)                                                                                |
|                                                                                                                                          |                                                                                      |
| Issuer’s telephone number, including area code: (412) 262-2830                                                                          |
|                                                                                                                                          |
| Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15 (d) of the Securities        |
| Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports),       |
| and (2) has been subject to such filing requirements for the past 90 days. Yes R No o                                                    |
|                                                                                                                                          |
| Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive    |
| Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12  |
| months (or for such shorter period that the registrant was required to submit and post such files). Yes o No R                                |
|                                                                                                                                          |
| Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller        |
| reporting company. See the definitions of "large accelerated filer", "accelerated filer", and "smaller reporting company" in Rule 12b-2 of    |
| the Exchange Act (Check One) Large accelerated filer  ̈ Accelerated filer  ̈ Non-accelerated filer  ̈ Smaller reporting company R |
|                                                                                                                                          |
| Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No R                   |
|                                                                                                                                          |
| Transitional Small Business Disclosure Format (check one): Yes o No R                                                                         |

| PART I.        |   | FINANCIAL INFORMATION                                                                               | PAGE   |
|----------------|--------|-----------------------------------------------------------------------------------------------------|--------|
|           |   |                                                                                                |   |
| Item 1:        |   | Financial Statements                                                                                |   |
|           |   |                                                                                                |   |
|           |   | Balance Sheet as of June 30, 2009                                                                   | 3      |
|           |   |                                                                                                |   |
|           |   | Statement of Operations for the period April 16, 2009 through June 30, 2009                         | 4      |
|           |   |                                                                                                |   |
|           |   | Statement of Changes in Partners’ Capital for the period April 16, 2009 through June 30, 2009 | 5      |
|           |   |                                                                                                |   |
|           |   | Statement of Cash Flows for the period April 16, 2009 through June 30, 2009                         | 6      |
|           |   |                                                                                                |   |
|           |   | Notes to Financial Statements                                                                       | 7-12   |
|           |   |                                                                                                |   |
| Item 2:        |   | Management’s Discussion and Analysis of Financial Condition and Results of Operations         | 12-16  |
|           |   |                                                                                                |   |
| Item 4:        |   | Controls and Procedures                                                                             | 16     |
|           |   |                                                                                                |   |
| PART II.       |   | OTHER INFORMATION                                                                                   |   |
|           |   |                                                                                                |   |
| Item 6:        |   | Exhibits                                                                                            | 17     |
|           |   |                                                                                                |   |
|           |   |                                                                                                |   |
| SIGNATURES     | 18     |
|           |   |                                                                                                |   |
| CERTIFICATIONS | 19-22  |

|                                    |   | June 30,    |        |
|-----------------------------------------|--------|-------------|-------------|
|                                    |   | 2009        |        |
|                                    |   | (Unaudited) |        |
| ASSETS                                  |   |        |        |
| Current assets:                         |   |        |        |
| Cash and cash equivalents               |   | $           | 552,000     |   |
| Accounts receivable – affiliate   |   |        | 7,000       |   |
| Total current assets                    |   |        | 559,000     |   |
|                                    |   |        |        |   |
| Oil and gas properties, net             |   |        | 23,945,000  |   |
| Construction in progress                |   |        | 101,696,400 |   |
|                                    |   | $           | 126,200,400 |   |
|                                    |   |        |        |   |
| LIABILITIES AND PARTNERS’ CAPITAL |   |        |        |   |
| Current liabilities:                    |   |        |        |   |
| Accrued liabilities                     |   | $           | 4,100       |   |
| Total current liabilities               |   |        | 4,100       |   |
|                                    |   |        |        |   |
| Asset retirement obligation             |   |        | 249,000     |   |
|                                    |   |        |        |   |
| Partners’ capital:                |   |        |        |   |
| Managing general partner                |   |        | 3,440,100   |   |
| Investor partners (12,278 units)        |   |        | 122,552,200 |   |
| Investor subscription receivable        |   |        | (45,000     | ) |
| Total partners' capital                 |   |        | 125,947,300 |   |
|                                    |   | $           | 126,200,400 |   |

| REVENUES                               |   |   |   |
|----------------------------------------|--------|--------|--------|
|                                   |   |   |   |
| Natural gas and oil                    |   | $      | 13,500 |   |
| Total revenues                         |   |   | 13,500 |   |
|                                   |   |   |   |   |
| COSTS AND EXPENSES                     |   |   |   |   |
| Production                             |   |   | 5,900  |   |
| Depletion                              |   |   | 5,400  |   |
| General and administrative             |   |   | 4,700  |   |
| Total expenses                         |   |   | 16,000 |   |
| Net loss                               |   | $      | (2,500 | ) |
|                                   |   |   |   |   |
| Allocation of net loss:                |   |   |   |   |
| Managing general partner               |   | $      | (500   | ) |
| Investor partners                      |   | $      | (2,000 | ) |
| Net loss per investor partnership unit |   | $      | (1     | ) |

|                                    |   |     |      |   |     |   |        |         |   |   |    |   |
|-----------------------------------------|--------|----------|-----------|--------|----------|--------|-------------|--------------|--------|--------|---------|--------|
|                                    |   | Managing |      |   |     |   |        | Investor     |   |   |    |   |
|                                    |   | General  |      |   | Investor |   |        | Subscription |   |   |    |   |
|                                    |   | Partner  |      |   | Partners |   |        | Receivable   |   |   | Total   |   |
|                                    |   |     |      |   |     |   |        |         |   |   |    |   |
| Balance at April 16, 2009               |   | $        | —   |   |     | $      | —     |         |   | $      | — |   |   | $ | — |   |
|                                    |   |     |      |   |     |   |        |         |   |   |    |   |   |   |   |   |
| Partners’ capital contributions:  |   |     |      |   |     |   |        |         |   |   |    |   |   |   |   |   |
| Cash                                    |   |     | —   |   |     |   | 122,554,200 |         |   |   | (45,000 | )      |   |   | 122,509,200 |   |
| Tangible equipment/leasehold costs      |   |     | 3,440,600 |   |     |   | —     |         |   |   | — |   |   |   | 3,440,600 |   |
| Total contributions                     |   |     | 3,440,600 |   |     |   | 122,554,200 |         |   |   | (45,000 | )      |   |   | 125,949,800 |   |
|                                    |   |     |      |   |     |   |        |         |   |   |    |   |   |   |   |   |
| Participation in revenues and expenses: |   |     |      |   |     |   |        |         |   |   |    |   |   |   |   |   |
| Net production revenues                 |   |     | 1,800     |   |     |   | 5,800       |         |   |   | — |   |   |   | 7,600 |   |
| Depletion                               |   |     | (1,200    | )      |     |   | (4,200      | )            |   |   | — |   |   |   | (5,400 | ) |
| General and administrative              |   |     | (1,100    | )      |     |   | (3,600      | )            |   |   | — |   |   |   | (4,700 | ) |
| Net loss                                |   |     | (500      | )      |     |   | (2,000      | )            |   |   | — |   |   |   | (2,500 | ) |
|                                    |   |     |      |   |     |   |        |         |   |   |    |   |   |   |   |   |
| Balance at December 31, 2008            |   | $        | 3,440,100 |   |     | $      | 122,552,200 |         |   | $      | (45,000 | )      |   | $ | 125,947,300 |   |

| Cash flows from operating activities:                                           |   |   |         |
|---------------------------------------------------------------------------------|--------|--------|--------------|
| Net loss                                                                        |   | $      | (2,500       | ) |
| Adjustments to reconcile net loss to net cash provided by operating activities: |   |   |         |   |
| Depletion                                                                       |   |   | 5,400        |   |
| Increase in accounts receivable-affiliate                                       |   |   | (7,000       | ) |
| Increase in accrued liabilities                                                 |   |   | 4,100        |   |
| Net cash provided by operating activities                                       |   |   | —      |   |
|                                                                            |   |   |         |   |
| Cash flows from investing activities:                                           |   |   |         |   |
| Oil and gas well drilling contract paid to MGP                                  |   |   | (121,957,200 | ) |
| Net cash used in financing activities                                           |   |   | (121,957,200 | ) |
|                                                                            |   |   |         |   |
| Cash flows from financing activities:                                           |   |   |         |   |
| Partners’ capital contribution                                            |   |   | 122,509,200  |   |
| Net cash provided by financing activities                                       |   |   | 122,509,200  |   |
|                                                                            |   |   |         |   |
| Net increase in cash and cash equivalents                                       |   |   | 552,000      |   |
| Cash and cash equivalents at beginning of period                                |   |   | —      |   |
| Cash and cash equivalents at end of period                                      |   | $      | 552,000      |   |
|                                                                            |   |   |         |   |
| Supplemental Schedule of non-cash investing and financing activities:           |   |   |         |   |
|                                                                            |   |   |         |   |
| Assets contributed by managing general partner:                                 |   |   |         |   |
| Lease costs                                                                     |   | $      | 695,800      |   |
| Tangible drilling costs                                                         |   |   | 2,744,800    |   |
|                                                                            |   | $      | 3,440,600    |   |
|                                                                            |   |   |         |   |
| Asset retirement obligation                                                     |   | $      | 249,000      |   |

| Oil and gas properties consist of the following at the dates indicated: |   | June 30, 2009 |       |
|-------------------------------------------------------------------------|--------|---------------|------------|
|                                                                    |   |          |       |
| Natural gas and oil properties:                                         |   |          |       |
| Proved properties:                                                      |   |          |       |
| Leasehold interests                                                     |   | $             | 695,800    |   |
| Wells and related equipment                                             |   |          | 23,254,600 |   |
|                                                                    |   |          | 23,950,400 |   |
|                                                                    |   |          |       |   |
| Accumulated depletion                                                   |   |          | (5,400     | ) |
|                                                                    |   | $             | 23,945,000 |   |

| ·   | Introduce a new definition of oil and gas producing activities. This new definition allows companies to include in their reserve base volumes from unconventional resources. Such unconventional resources include bitumen extracted from oil sands and oil and gas extracted from coal beds and shale formations. |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Report oil and gas reserves using an unweighted average price using the prior 12-month period, based on the closing prices on the first day of each month, rather than year-end pricing. This should maximize the comparability of reserve estimates among companies and mitigate the distortion of the estimates that arises when using a single pricing date. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Permit companies to disclose their probable and possible reserves on a voluntary basis. Current rules limit disclosure to only proved reserves. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Update and revise reserve definitions to reflect changes in the oil and gas industry and new technologies. New updated definitions include “by geographic area” and “reasonable certainty.” |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Permit the use of new technologies to determine proved reserves if those technologies have been demonstrated empirically to lead to reliable conclusions about reserves volumes. |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Require additional disclosures regarding the qualifications of the chief technical person who oversees the Partnership’s overall reserve estimation process. Additionally, disclosures are required related to internal controls over reserve estimation, as well as a report addressing the independence and qualifications of a Partnership’s  reservespreparer or auditor based on Society of Petroleum Engineers criteria. |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Administrative costs which are included in general and administrative expenses in the Partnership’s Statement of Operations are payable at $75 per well per month. Administrative costs incurred for the period ended June 30, 2009 were $200. |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Monthly well supervision fees which are included in production expenses in the Partnership’s Statement of Operations are payable at $975 per well per month for Marcellus wells and $1,500, for New Albany and Indiana Wells. For all other wells a fee of $392 is charged per well per month, for operating and maintaining the wells. Well supervision feesincurred for the period ended June 30, 2009 were $3,800. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Transportation fees which are included in production expenses in the Partnership's Statement of Operations are generally payable at 13% of the natural gas sales price. Transportation fees incurred for the period ended June 30, 2009 were $1,800. |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   |   |
|--------------------|--------|

|                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   | For the Period April 16, 2009 |    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-------------------------------|---------|
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   | Through June 30, 2009         |    |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |                          |    |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   | Level 3                       |    |   | Total |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |                          |    |   |   |   |
| Asset retirement obligations                                                                          |   | $                             | 249,000 |   |   | $ | 249,000 |   |
| Total                                                                                                 |   | $                             | 249,000 |   |   | $ | 249,000 |   |

|                                               |   | For the Period April 16, 2009 |    |
|----------------------------------------------------|--------|-------------------------------|---------|
|                                               |   | Through June 30, 2009         |    |
|                                               |   |                          |    |
| Asset retirement obligation at beginning of period |   | $                             | — |   |
| Liabilities incurred from drilling wells           |   |                          | 249,000 |   |
| Asset retirement obligation at end of period       |   | $                             | 249,000 |   |

| ITEM 2. | MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (UNAUDITED) |
|---------|---------------------------------------------------------------------------------------------------|

|                                |   | For the Period April 16, 2009 |    |
|-------------------------------------|--------|-------------------------------|---------|
|                                |   | Through June 30, 2009         |    |
| Production revenues (in thousands): |   |                          |    |
| Gas                                 |   | $                             | 13,500  |   |
| Oil                                 |   |                          | — |   |
| Total                               |   | $                             | 13,500  |   |
|                                |   |                          |    |   |
| Production volumes:                 |   |                          |    |   |
| Gas (mcf/day) (1)                   |   |                          | 156     |   |
| Oil (bbls/day) (1)                  |   |                          | — |   |
| Total (mcfe/day) (1)                |   |                          | 156     |   |
|                                |   |                          |    |   |
| Average sales prices:               |   |                          |    |   |
| Gas (per mcf) (1)                   |   | $                             | 3.92    |   |
| Oil (per bbl) (1)                   |   | $                             | — |   |
|                                |   |                          |    |   |
| Average production costs:           |   |                          |    |   |
| As a percent of revenues            |   |                          | 44      | % |
| Per mcfe (1)                        |   | $                             | 1.71    |   |
|                                |   |                          |    |   |
| Depletion per mcfe                  |   | $                             | 1.57    |   |

| (1)   | “Mcf” means thousand cubic feet, “mcfe” means thousand cubic feet equivalent and “bbls” means barrels. Bbls are converted to mcfe using the ratio of six mcfs to one bbl. |
|-----------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Introduce a new definition of oil and gas producing activities. This new definition allows companies to include in their reserve base volumes from unconventional resources. Such unconventional resources include bitumen extracted from oil sands and oil and gas extracted from coal beds and shale formations. |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Report oil and gas reserves using an unweighted average price using the prior 12-month period, based on the closing prices on the first day of each month, rather than year-end pricing. This should maximize the comparability of reserve estimates among companies and mitigate the distortion of the estimates that arises when using a single pricing date. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Permit companies to disclose their probable and possible reserves on a voluntary basis. Current rules limit disclosure to only proved reserves. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Update and revise reserve definitions to reflect changes in the oil and gas industry and new technologies. New updated definitions include “by geographic area” and “reasonable certainty.” |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Permit the use of new technologies to determine proved reserves if those technologies have been demonstrated empirically to lead to reliable conclusions about reserves volumes. |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Require additional disclosures regarding the qualifications of the chief technical person who oversees the Partnership’s overall reserve estimation process. Additionally, disclosures are required related to internal controls over reserve estimation, as well as a report addressing the independence and qualifications of a Partnership’s reservespreparer or auditor based on Society of Petroleum Engineers criteria. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| Exhibit No.     |   | Description                                                                                                |
|-----------------|--------|------------------------------------------------------------------------------------------------------------|
|            |   |                                                                                                       |
|   4.0 |   | Amended and Restated Certificate and Agreement of Limited Partnership for Public 18-2009 (B) L.P. (1)      |
| 10.1            |   | Drilling and Operating Agreement for Atlas America Public 18-2009 (B) L.P. (1)                             |
| 31.1            |   | Certification Pursuant to Rule 13a-14/15(d)-14                                                             |
| 31.2            |   | Certification Pursuant to Rule 13a-14/15(d)-14                                                             |
| 32.1            |   | Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley |
|            |   | Act of 2002                                                                                                |
| 32.2            |   | Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley |
|            |   | Act of 2002                                                                                                |

| (1) | Filed on October 15, 2008 in the Form S-1A Registration Statement dated October 15, 2008, File No. 333-150925-02 |
|-----|------------------------------------------------------------------------------------------------------------------|

| Pursuant to the requirements of the Securities of the Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                                                                                                                                                                                             |
| Atlas Resources Public 18-2009 (B) L.P.                                                                                                                                                          |
|                                                                                                                                                                                             |   |   |
|                                                                                                                                                                                             |   |   |
|                                                                                                                                                                                             |   |   |
|                                                                                                                                                                                             |   | Atlas Resources, LLC, Managing General Partner |
|                                                                                                                                                                                             |   |   |
| Date:  August 13, 2009                                                                                                                                                                 |   | By:/s/ Freddie M. Kotek |
|                                                                                                                                                                                             |   | Freddie M. Kotek, Chairman of the Board of Directors, Chief Executive Officer |
|                                                                                                                                                                                             |   | and President |
|                                                                                                                                                                                             |   |   |
|                                                                                                                                                                                             |   |   |
| In accordance with the Exchange Act, this report has been signed by the following persons on behalf of the registrant and in the capacities and on the dates indicated.                          |
|                                                                                                                                                                                             |
|                                                                                                                                                                                             |   |   |
|                                                                                                                                                                                             |   |   |
| Date:  August 13, 2009                                                                                                                                                                 |   | By:/s/ Freddie M. Kotek |
|                                                                                                                                                                                             |   | Freddie M. Kotek, Chairman of the Board of Directors, Chief Executive |
|                                                                                                                                                                                             |   | Officer and President |
|                                                                                                                                                                                             |   |   |
|                                                                                                                                                                                             |   |   |
| Date:  August 13, 2009                                                                                                                                                                 |   | By:/s/ Matthew A. Jones |
|                                                                                                                                                                                             |   | Matthew A. Jones, Chief Financial Officer |
|                                                                                                                                                                                             |   |   |
|                                                                                                                                                                                             |   |   |
| Date:  August 13, 2009                                                                                                                                                                 |   | By:/s/ Sean P. McGrath |
|                                                                                                                                                                                             |   | Sean P. McGrath, Chief Accounting Officer |
|                                                                                                                                                                                             |   |   |
|                                                                                                                                                                                             |   |   |
|                                                                                                                                                                                             |   |   |
|                                                                                                                                                                                             |   |   |
|                                                                                                                                                                                             |   |   |